Automatic window-lock.



J. 0. SCHURTZ.

AUTOMATIC WINDOW LOCK.

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JAJVIES OTIS SCHURTZ, OF GRAND RAPIDS, MICHIGAN.

AUTOMATIC WINDOW-LOCK.

Application led October 2S, 1910.

To all whom fit may concern:

Be it known that I, JAMES Oris SCHURTZ, a citizen of the United States of America, residing at Grand Rapids, in the county of Kent and State of Michigan, have invented certain new and useful Improvements in Automatic IVindow-Locks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements in automatic window locks and its object is to provide a lock that will be automatically operative, a lock that will securely hold the window sash wherever the same may be adjusted, to provide a lock that will prevent the sash from vibrating, to provide means for preventing the lock from being opened from the outside of the building, and to provide the device with various new and useful features hereinafter more fully described and particularly pointed out in the claims, reference being had to the accompanying drawings in which;

Figure l is a perspective of a. portion of a window with my device applied thereto; Fig. 2 a vertical section through the same; Fig. 3 a perspective detail of the case for the lock; Fig. 4L the same of the safety stop; Fig. 5 the same of the locking member; and Fig. 6 the same of the spring.

Like numbers refer to like parts in all of the figures.

My .invention consists essentially of a sheet metal housing, substantially rectangular, fixed on the top of the lower sash, a slide movable in slots in the housing and yieldingly engaging the upper sash and held in engagement therewith by a spring to prevent access to the locking pawl and a locking pawl pivoted in the housing and engaging the inner surface of the upper sash.

l represents a portion of the upper sash and 2 a portion of the lower sash of a window as usually constructed.

3 represents the housing preferably of sheet metal having a rectangular bottom YJortion secured to the top surface of the lower sash opposite the upper sash, and vertical, parallel sides extending upward from the bottom and spaced apart, these sides being provided with downwardly inclined slots 13 open at the end toward the upper sash, and in which is slidable a safety Specification of Letters Patent.

Patented Feb. 13, 1912.

Serial No. 589,648.

stop consisting of a piece of sheet metalhaving a bottom portion 12a slidable in the slots and side portions 12, ext-ending upward from each side of the bottom portion and slidably embracing the housing. The stop is yieldingly projected from the housing toward the upper sash and in Contact therewith by means of a spring l1 engaging the inner edge of the stop 12a at one end, and mounted atl the other end upon a transverse rivet 7 extending through the housing and connecting the vertical sides of the same to each other.

At each side of the spring is pivoted on the rivet 7, a locking pawl having parallel sides Ll, extending close to the inner surface of the housing each provided at its lower and with an open recess 9, to receive the rivet 7, and having a rear extension 10 to form a lever to manually release the pawl as occasion may require. The sides of the pawl are integral with a connecting member 4a, adjacent the surface of the upper sash, the same being curved and eccentric to the axis of the rivet 7 whereby as it descends it operates as a cam to engage the upper sash and securely hold the same.

The member 4&1 of the pawl is preferably covered with a` facing` strip of leather or similar slightly elastic material 6, whereby it adheres closely to the upper sash and also avoids marring the same. To hold this leather or material in place and further strengthen the pawl, a rivet 5 extends through the same and laterally engages the over-'lapping ends of the strip G.

To prevent the pawl from turning to reverse position about the rivet 7, it is provided with a shoulder 8L at each side and a stop S provided to engage the shoulder and limit the upward movement of the pawl so that it will drop back to place by gravity when raised,

It will be noted that this device is automatic in operation, cannot be inadvertently left unlocked, and that the guard l2a is always in close contact with the upper sash and efectually prevents lifting the locking member from the outside of the window.

Having thus fully described my invention, what I claim is 1. A window lock, comprising a housing having parallel sides provided with open end slots, a stop slidable in the slots, and projecting therefrom, a rivet connecting the sides of the housing, a spring mounted on the rivet and engaging the stop and a paWl pvoted on the rivet.

2. A Window lock, comprising a housing having vertical parallel sides spaced apart and provided with open end slots, a stop having a bottom slidable in the slots and sides extending upward and embracing the housing, a spring engaging the stop to project the same outward from the housing, a

paWl pivoted in the housing and partially inolosed by the stop, shoulders on the paWl, and a stop in the housing to engage the shoulder and limit the movement of the paWl.

JAMES OTIS SCHURTZ.

Witnesses D. A. SGHURTZ,

HAROLD A. SCHURTZ.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. C. 

